<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Chord Diagram</title>
<style>

body {
  font: 10px sans-serif;
}

.group-tick line {
  stroke: #000;
}

.ribbons {
  fill-opacity: 0.67;
}

</style>
</head>
<body>
<button>Reset</button>
<svg width="960" height="500">
</svg>
	<script
		src="${pageContext.request.contextPath}/static/fw/plugin/d3/d3.min.js"
		charset="utf-8"></script>
	<script>

	// From http://mkweb.bcgsc.ca/circos/guide/tables/
	var matrix = [
	  [11975,  5871, 8916, 2868],
	  [ 1951, 10048, 2060, 6171],
	  [ 8010, 16145, 8090, 8045],
	  [ 1013,   990,  940, 6907]
	];

	var svg = d3.select("svg"),
	    width = +svg.attr("width"),
	    height = +svg.attr("height"),
	    outerRadius = Math.min(width, height) * 0.5 - 40,
	    innerRadius = outerRadius - 30;

	var formatValue = d3.formatPrefix(",.0", 1e3);
	//弦
	var chord = d3.chord()
	    .padAngle(0.05)
	    .sortSubgroups(d3.descending);
	//弧
	var arc = d3.arc()
	    .innerRadius(innerRadius)
	    .outerRadius(outerRadius);
	//带状
	var ribbon = d3.ribbon()
	    .radius(innerRadius);

	var color = d3.scaleOrdinal()
	    .domain(d3.range(4))
	    .range(["#000000", "#FFDD89", "#957244", "#F26223"]);

	var g = svg.append("g")
	    .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
	    .datum(chord(matrix));

	var group = g.append("g")
	    .attr("class", "groups")
	  .selectAll("g")
	  .data(function(chords) { return chords.groups; })
	  .enter().append("g");

	group.append("path")
	    .style("fill", function(d) { return color(d.index); })
	    .style("stroke", function(d) { return d3.rgb(color(d.index)).darker(); })
	    .attr("d", arc);

	var groupTick = group.selectAll(".group-tick")
	  .data(function(d) { return groupTicks(d, 1e3); })
	  .enter().append("g")
	    .attr("class", "group-tick")
	    .attr("transform", function(d) { return "rotate(" + (d.angle * 180 / Math.PI - 90) + ") translate(" + outerRadius + ",0)"; });

	groupTick.append("line")
	    .attr("x2", 6);

	groupTick
	  .filter(function(d) { return d.value % 5e3 === 0; })
	  .append("text")
	    .attr("x", 8)
	    .attr("dy", ".35em")
	    .attr("transform", function(d) { return d.angle > Math.PI ? "rotate(180) translate(-16)" : null; })
	    .style("text-anchor", function(d) { return d.angle > Math.PI ? "end" : null; })
	    .text(function(d) { return formatValue(d.value); });

	g.append("g")
	    .attr("class", "ribbons")
	  .selectAll("path")
	  .data(function(chords) { return chords; })
	  .enter().append("path")
	    .attr("d", ribbon)
	    .style("fill", function(d) { return color(d.target.index); })
	    .style("stroke", function(d) { return d3.rgb(color(d.target.index)).darker(); });

	// Returns an array of tick angles and values for a given group and step.
	function groupTicks(d, step) {
	  var k = (d.endAngle - d.startAngle) / d.value;
	  return d3.range(0, d.value, step).map(function(value) {
	    return {value: value, angle: value * k + d.startAngle};
	  });
	}

	</script>
</body>
</html>